2100*(1+x)*x=118.87
    2100*(1+x)*x=110.25
    （186-X）/X=0.8
    （186-X）/X
    0.125671/x＝0.1289/0.86289
    0.4/100.58＝x/31.6
    （39.402+x）×2.5＝39.402+72.204-x
    （42.309+x）×2.5＝39.402+72.204-x
    x^2-3x+2=0
    52x+32x-112/5=6
    -50x+26-52x=6
    x^2-2x-3=9/5
    19.926cosx+10sinx=20.034
    19.26cosx+10sinx=20.34
    19.26cosx=12
    x(62-2x)=300
    (100-2x)*(50-2x)=3600
    -0.05x²-0.2x-3=0
    -0.05x*x-0.2x-3=0
    x^2-x=240

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